139204402 has 4 divisors (see below), whose sum is σ = 208806606. Its totient is φ = 69602200.

The previous prime is 139204391. The next prime is 139204421. The reversal of 139204402 is 204402931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204402931 = 19 ⋅10758049.

It can be written as a sum of positive squares in only one way, i.e., 136679481 + 2524921 = 11691^2 + 1589^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34801099 + ... + 34801102.

Almost surely, 2^139204402 is an apocalyptic number.

139204402 is a deficient number, since it is larger than the sum of its proper divisors (69602204).

139204402 is an equidigital number, since it uses as much as digits as its factorization.

139204402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69602203.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 139204402 is about 11798.4915137487. The cubic root of 139204402 is about 518.2639367902.

The spelling of 139204402 in words is "one hundred thirty-nine million, two hundred four thousand, four hundred two".